.content {
  width: 100%;
  padding: 0.2rem;
  text-align: center;
}
.content li {
  border: 1px solid #dddddd;
  float: left;
  width: 30%;
  margin-right: 5%;
  margin-bottom: 0.2rem;
}
.content li div img {
  width: 100%;
}
.content li:nth-of-type(3n) {
  margin-right: 0;
}
